I received an e-mail response from G. Schirmer, Inc.:Mr. _________,After looking at the exact edition that you have my colleagues and I were not around in 1897, but we have our own hypothesis: that this is to somehow signify “cut time of cut time.”In essence you are correct that it is composed in measures of 4/2 and the tempo marking indicates that the half note is the value getting the beat, but the way it is engraved shows that the whole notes may actually be the note that is receiving the beat.In which case the tempo marking should have probably said “whole note = 168,” but anyway, you are correct it is in 4/2 and with the half = 84.There are many engraving aspects from 1897 and before that we do not use anymore, and now you can see for obvious reasons why we do not.Best of luck,- Peter. Peter Stanley MartinProduction AssociateAssistant EditorG. Schirmer, Inc. / Associated Music Publishers257 Park Avenue South, New York, NY 10010
All you need to know about Schirmer is addressed in the fact that they cannot even give you a proper tempo ratio in that e-mail. Phil